Windmill.



J. c. PREWITT & c. Hlmml'cKsl WINDMILL APPLICATION FILEP MAR. Il. 1916-1922191090, Patented Apr. 3, 1917.

j 2 SHEETS-SHEET l.

and Clar/n /vend'ric/(s J C. PREWITT L C. HENDRICKS."

WINDMILL. APPLwATloNTILED MAR. Il, |916.

` Patented Apr. 3,1917.

.2 SHEETS-SHEET l/I/f' if m INVENTORS @raras rarrnnrr oniricaWINDIVIILL.

Specification of Letters Patent.

Patented Apr. 3, 1917.

Application filed March 11, 1916. Serial No. 83,507.

To all lwhom it may concern: Be it known that we, JOHN C. Pnnwrrr andCLARK HnNDnroKs, citizens of the United States, residing at SantaMargarita, in the county of San Luis @bispo and State of California,have invented new and useful Improvements in Windmills, of which thefollowing is a specification.

This invention relates to a wind mill. One of the objects of the presentinvention is to provide a simple, rigid, easily operated wind mill,which consists of a horizontally positioned oscillating beam, carrying asail frame at one end and an adjustable counter-weight at the other end.

Another object of the invention is to provide means for holding the beamand sail frame in trailing position in the wind, and

furthermore, to provide means for automatically rocking the sail frameat the .end of each stroke to change the angle of the sails and thedirection of the movement of the beam.

Another object is to either transmit the power created by theoscillating movement of the beam in such a manner that itl may be usedfor pumping water or operating other machinery used on the farm or inother places. Further objects will hereinafter appear.

The invention consists of the parts and the construction and combinationof parts, as hereinafter more fully describedv and claimed, havingreference to the accompanying drawings, in which- Figure 1 is a sideelevation of the wind mill. j

Fig. 2 is an enlarged cross section on line 2 2, Fig. 1.

Fig. 3 is an enlarged detail view in side elevation of one tiltedposition of the track members.

Referring to the drawings in detail, A indicates'a suitably shapedsupport on the upper end of which is turnably mounted a head 2, providedwith a pair of rearwardly extending fork-shaped bracket arms 3.Pivotally mounted between the arms 3 is an arm or beam 4, on one end ofwhich is mounted an adjustable counter-weight 5.

Fivotally mounted on the opposite end of the beam 4, as at 6 is a sailframe 7 in which is rigidly secured a plurality of sails or planes 8.The planes are lowered atright angles to the frame 7 and can 'onlyassume an angular position with relation to the wind which is supposedto be blowing in the direction of arrows a, by tilting the frame aboutits pivot 6. This is accomplished automatically at the end of eachstroke and will be later described.

Secured to the beam 4 just above the fulcrum point of same is a trackmember 9 and pivotally mounted between the arms 3, as at 10 is a trackmember 11, which is connected with the upper track 9 by means of a pairof cross links 12. Movement of the beam 4 to assume the dotted lineposition shown at 14 or 15 causes the track member 11 to assume anopposite angle, this movement being transmitted from the upper track bymeans of the cross links 12. The tracks will thus always assume oppositeangular positions during the movement of the main beam 4, except whenthis stands in the horizontal position shown. These angular positions ofthe tracks are of great importance as they provide means for tilting thesail frame at each end 0f the Oscillating movement of the beam 4. y y

Carried by the track 9 is a` weighted roller 16, the movements of whichare limited by means of stops 17 formed at each end of the track, andsimilarlymounted on they track v11 is a` weighted roller 18, the

movementsy of which are limited by stops 19. Pivotally connecting theupper roller 16 with the, sail frame is a link 20 and similarlyconnecting the lower roller of the sail frame is a link 21. Theoperation of thedevice will be as follows:

The counter-weight 5 is normally adjusted to permit the beam 4 to assumethe dotted line position, indicated at 15, when 'the velocity of thewind is not sufficient to operate the mill. ythe same time assume thedotted line posi- The sail frame will at tion indicated at 7a. Thepositions of the planes or sails 8 are such that the wind will strikethe ,planes on their lower surfaces, in-

dicated at 25. The wind'pressure thus eX- 'erted will raise the sailframe with connected beam 4 about its fulcrum point until the beamreaches the dotted line position, shown at 14. The position of the sailframe is. here automatically changed from the dotted line positionshownat 'l'b to that indicated at 7 and this is accomplished as follows:

4l-rlhe track member 9 assumes the same 110 l sail frame to thatindicated at 7a.

tilted position as the beam 4, while the connected cross links 12 willcause the track member 11 to assume the tilted position opposite to thatassumed by the track 12. The weighted roller 16 will thus have atendency to run down the track until it engages with the stop at thelower end,` while the roller 18 will run down the track 11 in theopposite direction until it reaches the opposite end of the stop 19.This movement of the rollers in the opposite'direction is transmittedthroughthe links 20 and 21 to rock the sail frame about its pivot 6, andthis is only accomplished when the beam assumes the angular positionsshown at 14 and 15, as the inclined positions of the track members 9 and11 are not suiiicient to permit the rollers to overcome the weight ofthe sail :frame until such positions are assumed by the beam 4. Themovement of the sail frame when the beam assumes the dotted'lineposition indicated at 14 from the position 7 b to that assumed at 7immediately presents the upper surfaces 26 of the sails to the wind. Allpressure is thus exerted at the downward direction, causing the beam tomove from theposition 14 to that shown at 15.

The angular position of the track members will again be graduallychanged during the movement of the beam and they will becomesuiiicientlyinclined when the position 15' is reached to permit therollers to run down and again change the position of the Means have alsobeen provided for the purpose of limiting the oscillating movement ofthe main beam,rand also for the purpose of limiting theangular movementof the sail frame. This is accomplished by providing an arm 30 which ispivotally mounted, as at 3l upon a pair of standards 32 carried by thelhead 3. One end of the arm 30 is proi vided with a wind vane 33 and theopposite end is provided with a V-shaped head 34, the lower endsof whichare adapted to engage projecting pins 35V formed on the upper roller 16.f The moment the Ywind reaches aV predetermined velocity it can easilybe seen that the pressure exerted againstv theV vane 33 will besuflicient to `move the arm from the position shown in Fig. 2 to a pointwhere the lowerA ends of the head 34 will move into the path of travelof the roller 16, as shown in Fig. 1. IThe projecting pins 35 will thusbe engaged vby the: head 34 and the movement of the roller limited. Theangular position of the sail frame is thus limited and as this controlsthe movement of the main beam, it can be seen that the oscillatingmovement will gradually decrease as the wind pressure eX- ceedsthedanger point.

A mill constructed as here shown may be used for a` great variety ofpurposes, but is particularly intended for operating plunger pumps. Thisi's accomplished by connecting the sucker rod 40 of the pump with thebeam 4 by means of connecting links 41. The oscillating movement of thebeam is thus transmitted to raise and lower the sucker rod 40 and isthus ideal for pumping purposes around farms and arid regions. Tt isobvious, however, that the oscillating movelnent created may beconverted into rotary or any movement desired and can thus be employedfor a great variety of purposes.

The materials and inish of the several parts ofthe device may otherwisebe such as the judgment and experience of the manufacturer may dictate.

We wish it understood that various changes in form, proportions andminor details of construction may be resorted to Within the scope of theappended claims, and that we do not wish to limit ourselves to thespecific design and construction here shown.

Having thus described our invention, what we claim and desire to secureby Letters Patent is- 1. The combination with the walking beam and thepivotally supported sail frame mounted thereon, of means forautomatically tilting the sail frame the moment the walk ing beamassumes a predetermined angle, said means including rods having one endof each connected with the sail frame at points above and below thepivot, tiltable tracks upon which the opposite ends of the rods aremovable, diagonal links connecting the tracks to tilt themsimultaneously, and a device Jfor limiting the tilting movement.

2. The combination with a support, of a rotary head on the support, anarm pivotally mounted in said head, a sail frame pivotally mounted onone end of the arm, a counterweight on the opposite end of the arm, aplurality of sails rigidly secured in the sail frame, a track membersecured to the arm, a second track member pivotally mounted below thearm, crossed links connecting the track members, a weighted rollermounted on each track member, and a link connecting each roller with thesail frame to automatically tilt the frame when predetermined positionsof the arm are reached.

3. The combination with a support, of a rotary head on the support, anarm pivotally mounted in said head, a sail frame pivotally mounted' onone end of the arm, a counterweight on the opposite end of the arm, aplurality of sails rigidly secured in the sail frame, a track membersecured to the arm, a second track member pivotally mounted below thearm, crossed links connecting the track members, a weighted rollermounted on each track member, a link connecting each roller with thesail frame to automatically tilt the frame when predetermined positionsof the arm are reached, and means for limiting the tilting movement ofthe sail frame.

4. The combination with a support, of a rotary head on the support, anarm pivotally mounted in said head, a sail frame pivotally mounted onone end of the arm, a counterweight on the opposite end of the arm, aplurality of sails rigidly secured in the sail frame, a track membersecured to the arm, a second track member pivotally mounted below thearm, crossed links connecting the track members, a weighted rollermounted on each track member, a link connecting each roller with thesail frame to Copies of this patent may be obtained for automaticallytilt the frame when predetermined positions of the arm are reached, agovernor arm pivotally mounted above the main arm, a wind vane on oneend of the governor arm, and a V-shapedprojection on the other end ofthe arm engagealole with one of the rollers to limit their movement.

In testimony whereof we have hereunto set our hands in the presence oftwo subscribing witnesses.

' JOHN C. PREWITI.

CLARK HENDRICKS. Witnesses:

GEORGE H. BYER, FRED A. BRIZJOLANA.

five cents each, by addressing the "Commissioner of Patents,

Washington, D. C.

